Boptbd: Bayesian Optimal Block Designs

Computes Bayesian A- and D-optimal block designs under the linear mixed effects model settings
using block/array exchange algorithm of Debusho, Gemechu and Haines (2018) <doi:10.1080/03610918.2018.1429617> where the interest is in a
comparison of all possible elementary treatment contrasts. The package also provides an optional
method of using the graphical user interface (GUI) R package 'tcltk' to ensure that it is user friendly.